To determine the sensitivity baseline and resistance risk of rice blast pathogen Magnaporthe oryzae to coumoxystrobin in Fujian Province.The sensitivity of 130 strains of rice blast fungus to syringate was determined using the mycelial growth rate method.The results showed that the EC50 values of 130 rice blast fungus strains tested for syringate were 0.028 0～0.280 2 μg/mL,with an average of 0.151 0±0.059 8 μg/mL.The sensitivity frequency distribution showed a continuous unimodal curve,following a skewed normal distribution,and there was no significant decrease in sensitivity in the subpopulation.It can be used as the baseline for the sensitivity of the rice blast fungus in Fujian Province to coumoxystrobin.Three low resistant and one medium resistant mutant strains were obtained through drug domestication,and their resistance levels were stably inherited.The mycelial growth rate and sporulation ability of the resistant mutant strains were lower than those of their parent strains.
维普
万方数据